Defensive publication

ABSTRACT

THIS INVENTION RELATES TO A LIGHT SENSITIVE VACUUM-DEPOSITIVE SILVER HALIDE ELEMENT COMPRISING A SUPPORT HAVING COATED OVER ONE SURFACE THEREOF SEPARATE CONTIGUOUS LAYERS COMPRISING IN ANY ORDER A HYDROPHILIC COLLOID LAYER OR LAYERS AND A VACUUM-DEPOSITED SILVER HALIDE LAYER, SAID COLLOID LAYER CONTAINING A SMALL AMOUNT OF AMMONIUM SALT, SUCH AS AMMONIUM HALIDES, SULFATE, OR NITRATE, WHEN IT IS POSITIONED BETWEEN THE SUPPORT AND THE SILVER HALIDE LAYER TO IMPRVE IMAGE QUALITY. SAID COLLOID LAYER CONTAINS A DEVELOPING AGENT SUCH AS HYDROQUINYL COMPOUND, A 3-PYRAZOLIDONE, ASCORBIC ACID, CATECHOL, PYROGALLOL, GALLIC ACID, OR P-PHENYLENE DIAMINE, WHEN IT SERVES AS AN OVERCOATING FOR THE SILVER HALIDE LAYER. OPTIONALLY, BOTH A COLLOIDAL SUBBING CONTAINING AN AMMONIUM SALT AND A COLLOIDAL OVERCOATING MAY BE USED; MOREOVER, THE DEVELOPING AGENT MAY BE INCORPORATED IN THE SUBBING LAYER, OVERCOATING LAYER, OR BOTH LAYERS WITH OR WITHOUT THE AMMONIUM SALT. IN A PREFERRED EMBODIMENT, THERE IS ALSO PROVIDED A NOVEL PROTECTIVE BACKING LAYER TO PREVENT FOGGING OF AN UNCOVERED VACUUM-DEPOSITED SILVER HALIDE ELEMENT WHICH COMPRISES A COMPOSITION OF SODIUM ETHYL CELLULOSE SULFATE WHICH MAY, IN ADDITION, CONTAIN FINELY DIVIDED SOLID PARTICLES. ALSO DISCLOSED IS A PROCESS FOR INCREASING THE SPEED OF AN UNEXPOSED VACUUM-DEPOSITED SILVER HALIDE ELEMENT COMPRISING HEATING THE UNEXPOSED ELEMENT TO A TEMPERATURE OF AT LEAST ABOUT 60* C., PREFERABLY BETWEEN 60* C. AND 150* C. THE VARIOUS ELEMENTS OF THIS INVENTION ARE SUBJECT TO SENSITIZATION AND STABILIZATION. THEY MAY CONTAIN SPEED INCREASING LAYERS OF ALKALI METAL HALIDE SALTS, SUCH AS DESCRIBED IN U.S. PATENT 3,316,095, OF RAACH ET AL., ISSUED APR. 25, 1967. THEY MAY BE CHEMICALLY SENSITIZED WITH GOLD AND OTHER METAL SALTS, AND STABILIZED AGAINST FOG BY THE COMBINATION OF A THIOSULFATE SALT AND A THIOCYANATE SALT, AS DESCRIBED IN U.S. 3,384,490, OF RES, DATED MAY 21, 1968. THEY MAY FURTHER CONTAIN EITHER CHEMICAL OR SPECTRAL PHOTOGRAPHIC SENSITIZERS AS DESCRIBED IN U.S. 3,442,649, OF RASCH ET AL., ISSUED MAY 6, 1969 (COLUMNS 2-6).

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 O.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically.

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Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Ofilce makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED JANUARY 26, 1971 T882 020 VACUUM-DEPOSITED LIHT SENSITIVESILVER HALIDE ELEMENT John A. Haefner, Kodak Park Works, Rochester, NY.14650 Filed May 18, 1970, Ser. No. 38,591 Int. Cl. G03c 1/74, 1/48 U.S.Cl. 96--76 No Drawing. 37 Pages Specification This invention relates toa light sensitive vacuum-deposited silver halide element comprising asupport having coated over one surface thereof separate contiguouslayers comprising in any order a hydrophilic colloid layer or layers anda vacuum-deposited silver halide layer, said colloid layer containing asmall amount of ammonium salt, such as ammonium halides, sulfate, ornitrate, when it is positioned between the support and the silver halidelayer to improve image quality. Said colloid layer contains a developingagent such as a hydroquinyl compound, a 3-pyrazolidone, ascorbic acid,catechol, pyrogallol, gallic acid, or p-phenylene diamine, when itserves as an overcoating for the silver halide layer. Optionally, both acolloidal subbing containing an ammonium salt and a colloidalovercoating may be used; moreover, the developing agent may beincorporated in the subbing layer, overcoating layer, or both layerswith or without the ammonium salt. In a preferred embodiment, there isalso provided a novel protective backing layer to prevent fogging of anuncovered vacuum-deposited silver halide element which comprises acomposition of sodium ethyl cellulose sulfate which may, in addition,contain finely divided solid particles. Also disclosed is a process forincreasing the speed of an unexposed vacuum-deposited silver halideelement comprising heating the unexposed element to a temperature of atleast about 60 0., preferably between 60 C. and 150 C.

The various elements of this invention are subject to sensitization andstabilization. They may contain speed increasing layers of alkali metalhalide salts, such as described in U.S. Patent 3,316,096, of Rasch etal., issued Apr. 25, 1967. They may be chemically sensitized with goldand other metal salts, and stabilized against fog by the combination ofa thiosulfate salt and a thiocyanate salt, as described in U.S.3,384,490, of Rees, dated May 21, 1968. They may further contain eitherchemical or spectral photographic sensitizers as described in U.S.3,442,649, of Rasch et al., issued May 6, 1969 (columns 2-6).

